Film composition, film made from the film composition and a multi-layer film including the film and articles made therefrom

Abstract

A film composition comprising from 5 to 75 percent by weight of an ethylene/α-olefin interpolymer composition (LLDPE), and from 25 to 95 percent by weight of a propylene/α-olefin interpolymer composition, and films made from the film composition, wherein the films exhibited synergistic physical properties, namely holding force and elastic recovery, are provided.

We claim: 
     
       1. A film composition comprising:
 (a) from 5 to 75 percent by weight of an ethylene/α-olefin interpolymer composition (LLDPE), based on the total weight of the film composition, having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons; 
 (b) from 25 to 95 percent by weight of a propylene/α-olefin interpolymer composition, based on the total weight of the film composition, wherein said propylene/α-olefin interpolymer composition comprises a propylene/α-olefin copolymer or a propylene/ethylene/butene terpolymer, wherein said propylene/α-olefin interpolymer has a crystallinity in the range of from 1 percent by weight to 30 percent by weight, a heat of fusion in the range of from 2 Joules/gram to 50 Joules/gram, and a DSC melting point in the range of 25° C. to 110° C., wherein a film formed from the film composition exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative film having the same thickness as the film but formed from materials without (a) and (b), and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative film. 
 
     
     
       2. A film comprising the film composition of  claim 1 , wherein the film exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative film having the same thickness as the film but formed from materials without (a) and (b) and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative film. 
     
     
       3. A multi-layer film comprising at least one layer which comprises the film composition of  claim 1  wherein the multi-layer film exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative multi-layer film having the same thickness as the multi-layer film but formed from materials without (a) and (b) and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative multi-layer film. 
     
     
       4. The multi-layer film according to  claim 3 , wherein the multi-layer film comprises two skin layers and one core layer derived from a film composition which comprises (a) from 5 to 75 percent by weight of an ethylene/α-olefin interpolymer composition (LLDPE), based on the total weight of the film composition, having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons; (b) from 25 to 95 percent by weight of a propylene/α-olefin interpolymer composition, based on the total weight of the film composition, wherein said propylene/α-olefin interpolymer composition comprises a propylene/α-olefin copolymer or a propylene/ethylene/butene terpolymer, wherein said propylene/α-olefin interpolymer has a crystallinity in the range of from 1 percent by weight to 30 percent by weight, a heat of fusion in the range of from 2 Joules/gram to 50 Joules/gram, and a DSC melting point in the range of 25° C. to 110° C. 
     
     
       5. The multi-layer film according to  claim 4 , wherein the multi-layer film exhibits a holding force (100/75) as measured in accordance with ASTM 4649 equal to or greater than a holding force (100/75) exhibited by a first comparative film having the same thickness as the multi-layer film and comprising two skin layers having the same composition as the skin layers of the multi-layer film and a core layer consisting essentially of the ethylene/α-olefin interpolymer composition used in the film composition of the multi-layer film, and wherein the core to skin thickness ratios of the first comparative film are the same as those of the multi-layer film. 
     
     
       6. A stretch hood comprising the multi-layer film according to  claim 4 . 
     
     
       7. A film composition for a core layer of a multilayer film comprising:
 (a) from 5 to 75 percent by weight of an ethylene/α-olefin interpolymer composition (LLDPE), based on the total weight of the film composition, having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons; 
 (b) from 25 to 95 percent by weight of a propylene/α-olefin interpolymer composition, based on the total weight of the film composition, wherein said propylene/α-olefin interpolymer composition comprises a propylene/α-olefin copolymer or a propylene/ethylene/butene terpolymer, wherein said propylene/α-olefin interpolymer has a crystallinity in the range of from 1 percent by weight to 30 percent by weight, a heat of fusion in the range of from 2 Joules/gram to 50 Joules/gram, and a DSC melting point in the range of 25° C. to 110° C., wherein a film formed from the film composition exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative film formed from materials without (a) and (b), and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative film. 
 
     
     
       8. A film comprising the film composition of  claim 7 , wherein the film exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative film formed from materials without (a) and (b), and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative film. 
     
     
       9. A multi-layer film comprising two skin layers and one core layer which comprises the film composition of  claim 1 , wherein the multi-layer film exhibits a holding force (100/75) as measured in accordance with ASTM 4649 that is greater than or equal to a holding force of a comparative multi-layer film having the same thickness as the multi-layer film but formed from materials without (a) and (b), and exhibits an elastic recovery (60/40) as measured in accordance with ASTM D4649 that is greater than or equal to an elastic recovery of the comparative multilayer film. 
     
     
       10. The multi-layer film according to  claim 9 , wherein the two skin layers comprise an ethylene/α-olefin interpolymer composition having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons. 
     
     
       11. A stretch sleeve comprising the multi-layer film according to  claim 9 .